Bjni Fortress (Armenian: Բջնի Բերդ), is a medieval Armenian fortress located in the village of Bjni in the Kotayk Province of Armenia. It sits upon the top and along the sides of a mesa that divides the village nearly in half. The larger portion of which is located west of the mesa and curves south, while a smaller portion is east. The walls of the fortress may only be seen from the western side of the village, and are easiest reached via a narrow dirt road that forks (take the left fork) and goes up the side of the hill past some residences. Bjni Fortress is 1,504 metres (4,934 ft) above sea level.